2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.restconf.server.spi;
10 import static com.google.common.base.Verify.verify;
11 import static com.google.common.base.Verify.verifyNotNull;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.base.VerifyException;
15 import com.google.common.collect.ImmutableList;
16 import com.google.common.collect.ImmutableMap;
17 import java.io.IOException;
18 import java.util.ArrayList;
19 import java.util.List;
20 import org.eclipse.jdt.annotation.NonNull;
21 import org.opendaylight.restconf.api.ApiPath;
22 import org.opendaylight.restconf.api.ApiPath.ApiIdentifier;
23 import org.opendaylight.restconf.api.ApiPath.ListInstance;
24 import org.opendaylight.restconf.api.ApiPath.Step;
25 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
26 import org.opendaylight.restconf.nb.rfc8040.Insert.PointNormalizer;
27 import org.opendaylight.restconf.server.api.DatabindContext;
28 import org.opendaylight.restconf.server.api.DatabindPath;
29 import org.opendaylight.restconf.server.api.DatabindPath.Action;
30 import org.opendaylight.restconf.server.api.DatabindPath.Data;
31 import org.opendaylight.restconf.server.api.DatabindPath.InstanceReference;
32 import org.opendaylight.restconf.server.api.DatabindPath.Rpc;
33 import org.opendaylight.yangtools.yang.common.ErrorTag;
34 import org.opendaylight.yangtools.yang.common.ErrorType;
35 import org.opendaylight.yangtools.yang.common.QName;
36 import org.opendaylight.yangtools.yang.common.QNameModule;
37 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
38 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
39 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
40 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
41 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
42 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodec;
43 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext;
44 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext.Composite;
45 import org.opendaylight.yangtools.yang.data.util.DataSchemaContext.PathMixin;
46 import org.opendaylight.yangtools.yang.model.api.ActionNodeContainer;
47 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
48 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
49 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
50 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
51 import org.opendaylight.yangtools.yang.model.api.TypedDataSchemaNode;
52 import org.opendaylight.yangtools.yang.model.api.stmt.RpcEffectiveStatement;
53 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
54 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
55 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack.Inference;
58 * Utility for normalizing {@link ApiPath}s. An {@link ApiPath} can represent a number of different constructs, as
59 * denoted to in the {@link DatabindPath} interface hierarchy.
62 * This process is governed by
63 * <a href="https://www.rfc-editor.org/rfc/rfc8040#section-3.5.3">RFC8040, section 3.5.3</a>. The URI provides the
64 * equivalent of NETCONF XML filter encoding, with data values being escaped RFC7891 strings.
66 public final class ApiPathNormalizer implements PointNormalizer {
67 private final @NonNull DatabindContext databind;
69 public ApiPathNormalizer(final DatabindContext databind) {
70 this.databind = requireNonNull(databind);
73 public @NonNull DatabindPath normalizePath(final ApiPath apiPath) {
74 final var it = apiPath.steps().iterator();
76 return new Data(databind, Inference.ofDataTreePath(databind.modelContext()), YangInstanceIdentifier.of(),
77 databind.schemaTree().getRoot());
80 // First step is somewhat special:
81 // - it has to contain a module qualifier
82 // - it has to consider RPCs, for which we need SchemaContext
84 // We therefore peel that first iteration here and not worry about those details in further iterations
86 final var firstModule = step.module();
87 if (firstModule == null) {
88 throw new RestconfDocumentedException(
89 "First member must use namespace-qualified form, '" + step.identifier() + "' does not",
90 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
93 var namespace = resolveNamespace(firstModule);
94 var qname = step.identifier().bindTo(namespace);
96 // We go through more modern APIs here to get this special out of the way quickly
97 final var modelContext = databind.modelContext();
98 final var optRpc = modelContext.findModuleStatement(namespace).orElseThrow()
99 .findSchemaTreeNode(RpcEffectiveStatement.class, qname);
100 if (optRpc.isPresent()) {
101 final var rpc = optRpc.orElseThrow();
103 // We have found an RPC match,
105 throw new RestconfDocumentedException("First step in the path resolves to RPC '" + qname + "' and "
106 + "therefore it must be the only step present", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
108 if (step instanceof ListInstance) {
109 throw new RestconfDocumentedException("First step in the path resolves to RPC '" + qname + "' and "
110 + "therefore it must not contain key values", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
113 final var stack = SchemaInferenceStack.of(modelContext);
114 final var stmt = stack.enterSchemaTree(rpc.argument());
115 verify(rpc.equals(stmt), "Expecting %s, inferred %s", rpc, stmt);
116 return new Rpc(databind, stack.toInference(), rpc);
119 final var stack = SchemaInferenceStack.of(modelContext);
120 final var path = new ArrayList<PathArgument>();
121 DataSchemaContext parentNode = databind.schemaTree().getRoot();
123 final var parentSchema = parentNode.dataSchemaNode();
124 if (parentSchema instanceof ActionNodeContainer actionParent) {
125 final var optAction = actionParent.findAction(qname);
126 if (optAction.isPresent()) {
127 final var action = optAction.orElseThrow();
130 throw new RestconfDocumentedException("Request path resolves to action '" + qname + "' and "
131 + "therefore it must not continue past it", ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
133 if (step instanceof ListInstance) {
134 throw new RestconfDocumentedException("Request path resolves to action '" + qname + "' and "
135 + "therefore it must not contain key values",
136 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
139 final var stmt = stack.enterSchemaTree(qname);
140 final var actionStmt = action.asEffectiveStatement();
141 verify(actionStmt.equals(stmt), "Expecting %s, inferred %s", actionStmt, stmt);
143 return new Action(databind, stack.toInference(), YangInstanceIdentifier.of(path), actionStmt);
147 // Resolve the child step with respect to data schema tree
148 final var found = parentNode instanceof DataSchemaContext.Composite composite
149 ? composite.enterChild(stack, qname) : null;
151 throw new RestconfDocumentedException("Schema for '" + qname + "' not found",
152 ErrorType.PROTOCOL, ErrorTag.DATA_MISSING);
155 // Now add all mixins encountered to the path
156 var childNode = found;
157 while (childNode instanceof PathMixin currentMixin) {
158 path.add(currentMixin.mixinPathStep());
159 childNode = verifyNotNull(currentMixin.enterChild(stack, qname),
160 "Mixin %s is missing child for %s while resolving %s", childNode, qname, found);
163 final PathArgument pathArg;
164 if (step instanceof ListInstance listStep) {
165 final var values = listStep.keyValues();
166 final var schema = childNode.dataSchemaNode();
167 if (schema instanceof ListSchemaNode listSchema) {
168 pathArg = prepareNodeWithPredicates(stack, qname, listSchema, values);
169 } else if (schema instanceof LeafListSchemaNode leafListSchema) {
170 if (values.size() != 1) {
171 throw new RestconfDocumentedException("Entry '" + qname + "' requires one value predicate.",
172 ErrorType.PROTOCOL, ErrorTag.BAD_ATTRIBUTE);
174 pathArg = new NodeWithValue<>(qname, parserJsonValue(stack, leafListSchema, values.get(0)));
176 throw new RestconfDocumentedException(
177 "Entry '" + qname + "' does not take a key or value predicate.",
178 ErrorType.PROTOCOL, ErrorTag.MISSING_ATTRIBUTE);
181 if (childNode.dataSchemaNode() instanceof ListSchemaNode list && !list.getKeyDefinition().isEmpty()) {
182 throw new RestconfDocumentedException(
183 "Entry '" + qname + "' requires key or value predicate to be present.",
184 ErrorType.PROTOCOL, ErrorTag.MISSING_ATTRIBUTE);
186 pathArg = childNode.getPathStep();
192 return new Data(databind, stack.toInference(), YangInstanceIdentifier.of(path), childNode);
195 parentNode = childNode;
197 final var module = step.module();
198 if (module != null) {
199 namespace = resolveNamespace(module);
202 qname = step.identifier().bindTo(namespace);
206 public @NonNull Data normalizeDataPath(final ApiPath apiPath) {
207 final var path = normalizePath(apiPath);
208 if (path instanceof Data dataPath) {
211 throw new RestconfDocumentedException("Point '" + apiPath + "' resolves to non-data " + path,
212 ErrorType.PROTOCOL, ErrorTag.DATA_MISSING);
216 public PathArgument normalizePoint(final ApiPath value) {
217 final var path = normalizePath(value);
218 if (path instanceof Data dataPath) {
219 final var lastArg = dataPath.instance().getLastPathArgument();
220 if (lastArg != null) {
223 throw new IllegalArgumentException("Point '" + value + "' resolves to an empty path");
225 throw new IllegalArgumentException("Point '" + value + "' resolves to non-data " + path);
228 public @NonNull Rpc normalizeRpcPath(final ApiPath apiPath) {
229 final var steps = apiPath.steps();
230 return switch (steps.size()) {
231 case 0 -> throw new RestconfDocumentedException("RPC name must be present", ErrorType.PROTOCOL,
232 ErrorTag.DATA_MISSING);
233 case 1 -> normalizeRpcPath(steps.get(0));
234 default -> throw new RestconfDocumentedException(apiPath + " does not refer to an RPC", ErrorType.PROTOCOL,
235 ErrorTag.DATA_MISSING);
239 public @NonNull Rpc normalizeRpcPath(final ApiPath.Step step) {
240 final var firstModule = step.module();
241 if (firstModule == null) {
242 throw new RestconfDocumentedException(
243 "First member must use namespace-qualified form, '" + step.identifier() + "' does not",
244 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
247 final var namespace = resolveNamespace(firstModule);
248 final var qname = step.identifier().bindTo(namespace);
249 final var stack = SchemaInferenceStack.of(databind.modelContext());
250 final SchemaTreeEffectiveStatement<?> stmt;
252 stmt = stack.enterSchemaTree(qname);
253 } catch (IllegalArgumentException e) {
254 throw new RestconfDocumentedException(qname + " does not refer to an RPC", ErrorType.PROTOCOL,
255 ErrorTag.DATA_MISSING, e);
257 if (stmt instanceof RpcEffectiveStatement rpc) {
258 return new Rpc(databind, stack.toInference(), rpc);
260 throw new RestconfDocumentedException(qname + " does not refer to an RPC", ErrorType.PROTOCOL,
261 ErrorTag.DATA_MISSING);
264 public @NonNull InstanceReference normalizeDataOrActionPath(final ApiPath apiPath) {
265 // FIXME: optimize this
266 final var path = normalizePath(apiPath);
267 if (path instanceof Data dataPath) {
270 if (path instanceof Action actionPath) {
273 throw new RestconfDocumentedException("Unexpected path " + path, ErrorType.PROTOCOL, ErrorTag.DATA_MISSING);
277 * Return the canonical {@link ApiPath} for specified {@link YangInstanceIdentifier}.
279 * @param path {@link YangInstanceIdentifier} to canonicalize
280 * @return An {@link ApiPath}
282 public @NonNull ApiPath canonicalize(final YangInstanceIdentifier path) {
283 final var it = path.getPathArguments().iterator();
285 return ApiPath.empty();
288 final var stack = SchemaInferenceStack.of(databind.modelContext());
289 final var builder = ImmutableList.<Step>builder();
290 DataSchemaContext context = databind.schemaTree().getRoot();
291 QNameModule parentModule = null;
293 final var arg = it.next();
295 // get module of the parent
296 if (!(context instanceof PathMixin)) {
297 parentModule = context.dataSchemaNode().getQName().getModule();
300 final var childContext = context instanceof Composite composite ? composite.enterChild(stack, arg) : null;
301 if (childContext == null) {
302 throw new RestconfDocumentedException(
303 "Invalid input '%s': schema for argument '%s' (after '%s') not found".formatted(path, arg,
304 ApiPath.of(builder.build())), ErrorType.APPLICATION, ErrorTag.UNKNOWN_ELEMENT);
307 context = childContext;
308 if (childContext instanceof PathMixin) {
309 // This PathArgument is a mixed-in YangInstanceIdentifier, do not emit anything and continue
313 builder.add(canonicalize(arg, parentModule, stack, context));
314 } while (it.hasNext());
316 return new ApiPath(builder.build());
319 private @NonNull Step canonicalize(final PathArgument arg, final QNameModule prevNamespace,
320 final SchemaInferenceStack stack, final DataSchemaContext context) {
321 // append namespace before every node which is defined in other module than its parent
322 // condition is satisfied also for the first path argument
323 final var nodeType = arg.getNodeType();
324 final var module = nodeType.getModule().equals(prevNamespace) ? null : resolvePrefix(nodeType);
325 final var identifier = nodeType.unbind();
327 // NodeIdentifier maps to an ApiIdentifier
328 if (arg instanceof NodeIdentifier) {
329 return new ApiIdentifier(module, identifier);
332 // NodeWithValue addresses a LeafSetEntryNode and maps to a ListInstance with a single value
333 final var schema = context.dataSchemaNode();
334 if (arg instanceof NodeWithValue<?> withValue) {
335 if (!(schema instanceof LeafListSchemaNode leafList)) {
336 throw new RestconfDocumentedException(
337 "Argument '%s' does not map to a leaf-list, but %s".formatted(arg, schema),
338 ErrorType.APPLICATION, ErrorTag.INVALID_VALUE);
340 return ListInstance.of(module, identifier, encodeValue(stack, leafList, withValue.getValue()));
343 // The only remaining case is NodeIdentifierWrithPredicates, verify that instead of an explicit cast
344 if (!(arg instanceof NodeIdentifierWithPredicates withPredicates)) {
345 throw new VerifyException("Unhandled " + arg);
347 // A NodeIdentifierWithPredicates adresses a MapEntryNode and maps to a ListInstance with one or more values:
348 // 1) schema has to be a ListSchemaNode
349 if (!(schema instanceof ListSchemaNode list)) {
350 throw new RestconfDocumentedException(
351 "Argument '%s' does not map to a list, but %s".formatted(arg, schema),
352 ErrorType.APPLICATION, ErrorTag.INVALID_VALUE);
354 // 2) the key definition must be non-empty
355 final var keyDef = list.getKeyDefinition();
356 final var size = keyDef.size();
358 throw new RestconfDocumentedException(
359 "Argument '%s' maps a list without any keys %s".formatted(arg, schema),
360 ErrorType.APPLICATION, ErrorTag.INVALID_VALUE);
362 // 3) the number of predicates has to match the number of keys
363 if (size != withPredicates.size()) {
364 throw new RestconfDocumentedException(
365 "Argument '%s' does not match required keys %s".formatted(arg, keyDef),
366 ErrorType.APPLICATION, ErrorTag.INVALID_VALUE);
369 // ListSchemaNode implies the context is a composite, verify that instead of an unexplained cast when we look
370 // up the schema for individual keys
371 if (!(context instanceof Composite composite)) {
372 throw new VerifyException("Unexpected non-composite " + context + " with " + list);
375 final var builder = ImmutableList.<String>builderWithExpectedSize(size);
376 for (var key : keyDef) {
377 final var value = withPredicates.getValue(key);
379 throw new RestconfDocumentedException("Argument '%s' is missing predicate for %s".formatted(arg, key),
380 ErrorType.APPLICATION, ErrorTag.INVALID_VALUE);
383 final var tmpStack = stack.copy();
384 final var keyContext = composite.enterChild(tmpStack, key);
385 if (keyContext == null) {
386 throw new VerifyException("Failed to find key " + key + " in " + composite);
388 if (!(keyContext.dataSchemaNode() instanceof LeafSchemaNode leaf)) {
389 throw new VerifyException("Key " + key + " maps to non-leaf context " + keyContext);
391 builder.add(encodeValue(tmpStack, leaf, value));
393 return ListInstance.of(module, identifier, builder.build());
396 private String encodeValue(final SchemaInferenceStack stack, final TypedDataSchemaNode schema, final Object value) {
397 @SuppressWarnings("unchecked")
398 final var codec = (JSONCodec<Object>) databind.jsonCodecs().codecFor(schema, stack);
399 try (var jsonWriter = new HackJsonWriter()) {
400 codec.writeValue(jsonWriter, value);
401 return jsonWriter.acquireCaptured().rawString();
402 } catch (IOException e) {
403 throw new IllegalStateException("Failed to serialize '" + value + "'", e);
407 private NodeIdentifierWithPredicates prepareNodeWithPredicates(final SchemaInferenceStack stack, final QName qname,
408 final @NonNull ListSchemaNode schema, final List<@NonNull String> keyValues) {
409 final var keyDef = schema.getKeyDefinition();
410 final var keySize = keyDef.size();
411 final var varSize = keyValues.size();
412 if (keySize != varSize) {
413 throw new RestconfDocumentedException(
414 "Schema for " + qname + " requires " + keySize + " key values, " + varSize + " supplied",
415 ErrorType.PROTOCOL, keySize > varSize ? ErrorTag.MISSING_ATTRIBUTE : ErrorTag.UNKNOWN_ATTRIBUTE);
418 final var values = ImmutableMap.<QName, Object>builderWithExpectedSize(keySize);
419 final var tmp = stack.copy();
420 for (int i = 0; i < keySize; ++i) {
421 final QName keyName = keyDef.get(i);
422 final var child = schema.getDataChildByName(keyName);
423 tmp.enterSchemaTree(keyName);
424 values.put(keyName, prepareValueByType(tmp, child, keyValues.get(i)));
428 return NodeIdentifierWithPredicates.of(qname, values.build());
431 private Object prepareValueByType(final SchemaInferenceStack stack, final DataSchemaNode schemaNode,
432 final @NonNull String value) {
433 if (schemaNode instanceof TypedDataSchemaNode typedSchema) {
434 return parserJsonValue(stack, typedSchema, value);
436 throw new VerifyException("Unhandled schema " + schemaNode + " decoding '" + value + "'");
439 private Object parserJsonValue(final SchemaInferenceStack stack, final TypedDataSchemaNode schemaNode,
440 final String value) {
441 // As per https://www.rfc-editor.org/rfc/rfc8040#page-29:
443 // "api-identifier" and "key-value" MUST conform to the JSON identifier
444 // encoding rules in Section 4 of [RFC7951]: The RESTCONF root resource
445 // path is required. Additional sub-resource identifiers are optional.
446 // The characters in a key value string are constrained, and some
447 // characters need to be percent-encoded, as described in Section 3.5.3.
449 return databind.jsonCodecs().codecFor(schemaNode, stack).parseValue(null, value);
450 } catch (IllegalArgumentException e) {
451 throw new RestconfDocumentedException("Invalid value '" + value + "' for " + schemaNode.getQName(),
452 ErrorType.PROTOCOL, ErrorTag.INVALID_VALUE, e);
456 private @NonNull QNameModule resolveNamespace(final String moduleName) {
457 final var it = databind.modelContext().findModuleStatements(moduleName).iterator();
459 return it.next().localQNameModule();
461 throw new RestconfDocumentedException("Failed to lookup for module with name '" + moduleName + "'.",
462 ErrorType.PROTOCOL, ErrorTag.UNKNOWN_ELEMENT);
466 * Create prefix of namespace from {@link QName}.
468 * @param qname {@link QName}
469 * @return {@link String}
471 private @NonNull String resolvePrefix(final QName qname) {
472 return databind.modelContext().findModuleStatement(qname.getModule()).orElseThrow().argument().getLocalName();